Posted by
Marten Darmawan on
Jul 07, 2010; 5:07am
URL: http://imagej.273.s1.nabble.com/Signal-to-Noise-Ratio-SNR-tp3687681p3687685.html
If you want to measure the entropy (statistical approach) for a particular
signal frequency without using GLCM (Grey Level Co-occurence Matrix), as
best as I know, it should be a new definition of entropy (texture analysis
second order). Even though it might be derived from first order statistical
approach, I don't have any idea about what information that you want to
extract from FFT result so you could obtain the entropy information. I
suggest you to use the Gabor filter if you want to obtain the statistical
information for a particular signal frequency.
Best regard,
Marten Darmawan
Gadjah Mada University
martendarmawan.wordpress.com
On Wed, Jul 7, 2010 at 11:01 AM, Gea O.F. Parikesit <
[hidden email]>wrote:
> I am not aware of any existing plugin that measures entropy directly from
> FFT, but you could easily write a macro for this. That being said, I wonder
> why would you need the FFT, rather than the grey-values itself? Are you
> interested in certain spatial frequencies in your images?
>
> Best regards,
> Gea Parikesit
> Gadjah Mada University
>
http://gea.ari.googlepages.com/microfluidicsugm>
>
> --- On Tue, 6/7/10, Widodo D. Putro <
[hidden email]> wrote:
>
> From: Widodo D. Putro <
[hidden email]>
> Subject: Entropy measurement
> To:
[hidden email]
> Received: Tuesday, 6 July, 2010, 10:53 PM
>
> Dear ImageJ users,
>
> I wonder is there any ImageJ plugin to measure the entropy coefficient
> derived
> from FFT of a stack of images?
> I've used the Texture Analyzer plugin by Mr. Cabrera, but it defined the
> entropy
> from gray level co-occurence matrix not from FFT.
>
> Thank you,
> Regards.
>
> --
> Widodo D. Putro
>
> Institute of Technology Bandung
> Jl. Ganesha 10, Bandung, Indonesia
>
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